/*
day77
2019.11.13 

*/ 

#include<string>
using namespace std;


class Solution {
public:
    string toLowerCase(string str) {
    	
    	for(int i=0;i<str.size();i++)
    	{
    		if(str[i]<='Z' && str[i]>='A')
    		{
    			str[i]+=32;
			}
		}
    	
        return str;
    }
};




int main()
{
	return 0;
}
